[Pep Boix]

Hi all

First of all , txs for helping me
I've an old TFT monitor that is experiencing a problem.
The problem is simple .... It works well ... then suddenly it comes ultrabright ... quite white. The picture is quite impossible to view due to the extreme brightness ...
It can be more than 1 hour like this and suddenly again return to the correct brightness. Each time the balance time well/bad is lower (more time bad than well).
The model is LG FLATRON LCD575MS and I have the schematics downloaded from this page but i don't know wich is the problem.
Another thing to be considered: The behaviour is the same without PC signal .... The OSD menu is bright too

Txs in advance

Pep